diff --git a/.gitignore b/.gitignore
index 45669d6..1b6dc5a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,8 +2,6 @@
 .*
 !.gitignore
 !.readthedocs.yaml
-!.flake8
-!.flake8_nb
 !.github
 
 # Byte / compiled / optimized
diff --git a/pyproject.toml b/pyproject.toml
index e708b68..89a10c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ classifiers = [
 ]
 requires-python = ">=3.10"
 dependencies = [
+    "defusedxml",
     "ewokscore<5",
     "reportlab",
     "typing-extensions; python_version < '3.11'",
@@ -35,7 +36,7 @@ test = [
 ]
 dev = [
     "pytest >=7",
-    "ruff",
+    "ruff>=0.16.0",
     "mypy",
 ]
 doc = [
@@ -61,10 +62,21 @@ src = ["."]
 line-length = 88
 
 [tool.ruff.lint]
-select = ["E", "F", "I"]
+select = [
+    "E", # pycodestyle errors
+    "F", # pyflakes
+    "I", # isort
+    "S", # flake8-bandit
+]
+
+[tool.ruff.lint.per-file-ignores]
+"src/ewoksdraw/tests/*.py" = [
+    "S101"  # allow asserts
+]
 
 [tool.ruff.lint.isort]
 force-single-line = true
+known-first-party = ["ewoksdraw"]
 
 [tool.mypy]
 ignore_missing_imports = true
diff --git a/src/ewoksdraw/svg/svg_canvas.py b/src/ewoksdraw/svg/svg_canvas.py
index b2f445e..46c5694 100644
--- a/src/ewoksdraw/svg/svg_canvas.py
+++ b/src/ewoksdraw/svg/svg_canvas.py
@@ -2,11 +2,11 @@
 from typing import Iterator
 from typing import List
 from typing import Union
-from xml.dom import minidom
 from xml.etree.ElementTree import Element
 from xml.etree.ElementTree import tostring
 
 import xmltodict
+from defusedxml import minidom
 
 from .svg_background import SvgBackground
 from .svg_element import SvgElement
diff --git a/src/ewoksdraw/tests/test_graph_to_svg.py b/src/ewoksdraw/tests/test_graph_to_svg.py
index 99be1c3..02e86b4 100644
--- a/src/ewoksdraw/tests/test_graph_to_svg.py
+++ b/src/ewoksdraw/tests/test_graph_to_svg.py
@@ -1,7 +1,7 @@
 from pathlib import Path
-from xml.etree import ElementTree
 
 import pytest
+from defusedxml import ElementTree
 from ewokscore import load_graph
 from ewokscore.tests.examples.graphs import get_graph
 from ewokscore.tests.examples.graphs import graph_names
diff --git a/src/ewoksdraw/tests/test_svg_path_integration.py b/src/ewoksdraw/tests/test_svg_path_integration.py
index bd5c148..ec113c5 100644
--- a/src/ewoksdraw/tests/test_svg_path_integration.py
+++ b/src/ewoksdraw/tests/test_svg_path_integration.py
@@ -1,5 +1,6 @@
 from pathlib import Path
-from xml.etree import ElementTree
+
+from defusedxml import ElementTree
 
 from ewoksdraw.geometry.cubic_bezier_path import CubicBezierPath
 from ewoksdraw.geometry.cubic_bezier_path import CubicBezierSegment